What is the mantissa method of data analysis speed algorithm?

The quick calculation method for determining the option by calculating the last few digits of the formula is called the mantissa method.

The mantissa method is used in addition, subtraction, and a mixture of addition and subtraction, and can also be applied in some multiplication methods with specific mantissa numbers. As the name suggests, the mantissa method is to look at the mantissa of the calculation formula, simplify the amount of calculation, and then quickly select the answer.

Application steps: 1. The last digits of the observation options are different;

2. The last digits of the original formula can be calculated.

Precautions: 1. Addition carrying, subtraction borrowing;

2. Pay attention to the position of the option and the original response.

1. Concept. The quick calculation method for determining options by calculating the last few digits of a formula is called the mantissa method.

2. Applicable environment.

The mantissa method is mainly used in addition and subtraction, and occasionally in multiplication.

3. Application. If the last digit of the option is different, the last digit of the original formula is counted; If the last two digits of the options are different, the last two digits of the original formula are counted.

4. Precautions.

1.Alignment of the digits: When the number of digits after the decimal point of the given numbers is different, you need to add 0 at the end to make up the digits.

2.When there are multiple additions and subtractions in the equation, you can calculate the addition first and then the subtraction.

Example) Answer] This is a calculation of addition and subtraction, you can use the mantissa method, observe that the last digit of the four options is different, then you only need to calculate the last digit of the original formula, 5+9+8 mantissa is 2, so choose b.

Example) Answer] This question is an addition and subtraction operation, using the mantissa method, observing the options and finding that the last digit of the four options is different, then calculate the last digit of the original formula, because there is only one digit after the fourth decimal point in the original formula, and the other numbers have two digits after the decimal point, and need to be rewritten before the calculation, then the last digit is calculated as 7 + 9 + 5 + 8 + 0 + 1, and the mantissa is 0, so choose the answer c.

Example) Answer] This question is an addition and subtraction operation, using the mantissa method, observing that the last digit of the four options is different, calculating the last digit of the original formula, 2-7-5-1 = 2-(7+5+1)=2-3 mantissa is 9, so choose the answer c.

The above is the specific application of the mantissa method, through the above example questions, you can find that the core is to choose the number of digits reasonably according to the options, which can reduce the amount of calculation to a large extent, so as to improve the calculation speed, of course, if you want to use this method very proficiently, you also need candidates to do more practice on a regular basis, so that you can be handy in the exam!